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ToolSuite
Image Tools

Alpha Channel Extractor

See an image’s transparency on its own, as a black and white mask.

or drag it here

image/* · up to 40 MB

Processed in your browser

Fill in the form and press “Extract alpha” to see the result here.

How to use it

  1. 1Select your image, or drag and drop it onto the upload area.
  2. 2Adjust the options if you need something other than the defaults.
  3. 3Press the button. The image is processed on your device - nothing is uploaded.
  4. 4Download the result, or drop in another file to do it again.

About the Alpha Channel Extractor

The alpha channel is rendered as greyscale: white is fully opaque, black is fully transparent, grey is partial.

This is the fastest way to judge a cut-out. A clean mask has hard edges; a poor one shows a grey fringe, which is what produces a halo when the image is placed on a different background.

Questions people ask

Is your image uploaded to a server?

No. This tool runs entirely in your browser using standard web APIs, so your image never leaves your device. You can confirm it by opening your browser's network panel while the tool runs, or by disconnecting from the internet after the page has loaded.

Is it free, and do I need an account?

Yes, it is free, and there is no account, no sign-up and no watermark on the result. The project is funded by optional donations.